Speed-indicator.



F. SPALDING. SPEED INDIGATR.

APPLICATION FILED APB.15, 1908.

Patented Mar. 8, 1910.

SATEE @FFIQFL FRANK SPALDING, 0F PROVIDENCE, RHODE ISLAND, ASSIGNOR TO:EROI/VN & SHARPE MANUFACTURING COMPANY, OF PROVIDENCE, RHODE ISLAND.

SPEED-INDICATOR.

T o all whom it may concern:

Be it known that I, FRANK SPALDING, a citizen of the United States,residing at Providence, in the county of Providence and State of RhodeIsland, have invented a new and useful Improvement in Speed -Indicators,of which the following is a specification.

lThis invention has reference to an improvement in instruments used formeasuring or recording the speed of revolving shafts and moreparticularly to an improvement in speed indicators adapted to record therevolutions of a shaft from one to tive thousand revolutions.

In speed indicators as heretofore constructed (having revolvingindicating` disks) the means for intermittently holding one of thedisks, usually, consists of an external spring linger engaging with thenotches in the disk. These spring fingers are liable to get bent orbroken, thereby ruining the utility ot the indicator, also the meansused for turning back the disks are generally crude in construction anddiiiicult to manipulate.

The object of my invention is to improve the construction of a speedindicator, whereby the means for intermittently holding the revolvingindicating disks are protected from injury and strengthened inconstruction and the indicator provided with means for turning back thedisk which can be easily and quickly manipulated by the operator.

My invention consists in the peculiar and novel construction of a speedindicator having an internal spring actuated latch for intermittentlyholding the revolving indicating disk, a protruding wheel engaging withthe periphery of the indicating disk for setting back the disk, andother details of construction as will be more fully set forthhereinafter and claimed.

Figure 1 is a face view of my improved speed indicator. Fig. 2 is a backview of the speed indicator. Fig. 3 is an enlarged detail sectionalview, showing the interior construction of the indicator looking towardthe back. Fig. 4 is an enlarged transverse sectional view taken on line4 4 of Fig. 1 through the indicator. Fig. 5 is an enlarged detailsectional view looking at the underside of the spring latch, and Fig. 6is an enlarged detail view looking at the inner face of the springlatch.

Specification of Letters Patent.

Application filed April 15, 1908.

Patented Mar. 8, 1910.

serial No. 427,246.

In the drawings, a, indicates the frame, b the handle, c the spindle, dthe worm gear, e the rotatable latch, g the setback wheel, h the frontfixed indicating disk, a' the rotatable front pointer, 7c the back iixedindicating disk, and Z the rotatable back pointer of my improved speedindicator.

The frame a has a longitudinal bore 7 for the spindle c intersecting acircular recess 8 which extends in from the face ot the trame and has acentral hole 9 which extends through the back 10 of the frame for thehub of the worm gear (Z, a forwardly-extending boss 11 in which is aradial hole 12 for the latch f, and a downwardly-extending portion 13recessed in the face for the set-back wheel g, as shown in Figs. 3 and4.

The handle b is secured to the rear end of the frame ct in the usual wayor may be formed integral with the frame.

The spindle c has the worm 14 on its inner end, a sleeve 15 having apointed end 16 trictionally secured to its outer end and is rotatablysecured in the bore 7 by a screw in the frame a engaging with acircumferential groove in the spindle, as shown in Fig. 3.

The worm gear Z meshes with the worm 14 on the spindle c and is in theform ot a tlat disk having a central hub 17 which extends equally onboth sides of the gear and the length of which equals the thickness ofthe frame a. The rear end of the hub 17 is rotatably supported in thehole 9 in the back 10 ot the frame a, as shown in Fig. 4. A stud 18 issecured to the tace ot the worm gear Z in a position to engage with thelatch f, as shown in Figs. 3 and 5.

The rotatable indicating disk e has a toothed or milled edge, a centralcircular cavity 19 for a spring washer 20 merging into a central hole 21for the forward end of the worm gear hub 17, the outer circular steppedportion 22 for the front fixed indieating disk 7Ly and the innercircular stepped portion 23. A disk 24 having a series of fifty V-shapednotches 25 in its periphery is secured to the inner face of the disk c,as shown in Fig. 4, or may be formed integral with the disk c.

The latch f is in the form of a pin having a flattened tace 26 adaptedto engage with the inner face of the indicating disk e and hold thelatch from turning, a V-shaped inner end 27 adapted to engage with theif-shaped notches 25 in the periphery ot the disk 2li, a l/-shapedshoulder 2S on the back, and a collar 29 adjacent the inner end ot thelatch. A screw-threaded ring 3 is screwed into the end ot the boss 11and a coiled spring 31 is placed on the latch intermediate the collar 29on the latch and the ring 230, shown in Fig. 3. i

rthe set-back wheel g has a toothed or milled edge and is rotatablysecured to the portion 13 ot' the trame a by a screw 32 in a positiontor the edge on the periphery ot the wheel to engage with the toothed ormilled edge or periphery of the indicating disk e, as shown in Figs. 3and 4.

The front iixed indicating disk 7i has central opening t'or the raisedcentral portion of the disk e, and is recessed into the tace of thetrame ci tlush with the surface ot the trame where it is held by a screwor other means. This disk has inner and outer graduations on its tace,as shown in lfig. 1.

The iront pointer z' is secured to the front end otl the worin gear hub17 by a screw 33 which forces the pointer against the spring washer 20,thereby forcing the indicating disk c into frictional Contact with theworm gear CZ, as shown in Fig. L1-.

The back fixed indicating disk it' has a central opening` and isrecessed into the back 10 of the trame flush with the surt'ace or" theframe, where it is held by a screw or other means. This disk has outergraduations on its t'ace (as shown in Fig. 2) corresponding` to theouter graduations on the disk z.

The back pointer Z is secured to the back end of the worm gear hub 17 bya screw 33, as shown in F la Villien in use the indicating` disk e isheld normally from rotating by the V-shaped end 2T of the latch f'engaging with a ll-shaped notch 25 in the disk 2a, as shown in liig. G.The pointers revolve in the direction o1 the arrows, as shown in Figs. 1and `When the worm gear Z completes one revolution the pointers haveindicated one hundred revolutions ot the spindle c. The stud 18 on theworm gear d now engages with the lf-shaped shoulder' 28 on the latch jiand moves the latch outward against the tension ot` the sprintf' 31,releasing the indicating disk c. The i'rictional contact of the wormgear Z on the disk e moves the disk c one notch or one-tittieth of arevolution, when the stud 18 passing by the latch releases the latch andallows the same to engage with the next notch in the periphery oit thedisk 2a. rlhe reading is now one hundred revolutions ot the spindle. Asthe spindle continues to revolve these operations are repeated, thelatch f acting to release and engage the disk e t'or each one hundredrevolutions ot the spindle or until the spindle has revolved ivethousand times, when the indicator will repeat. The indicating disk emay be easily and quickly set back at any time by revolving the set-backwheel (j in either direction. the wheel eing placed in a convenientposition :tor the tinger or thumb ot the operator to engage with thetoothed or milled edge otl the wheel.

Having thus described my invention, vI claim as new and desire to secureb v lietters Patentz-e 1. ,ln a speed indicator, a spindle, a worm onthe spindle, a w rin gear meshing with the worm, an indicating disk, andme ns operatively connected with the indicating disk, whereby theindicating disk may be revolved by hand independent et" the worm or wormgear.

i). in a speed indicator, a spindle, a worm on the spindle, a worin gearmeshing with the worin, an indicating disk, means tor holding theindicating disk in trictional con tact with the worm gear, and a wheeloper atively connected with the indicating disk, v-.fhereby theii'idicating disk may be revolved by hand independent of the worm gear.

In a speed indicator, a spindle, a worm on the spindle, a worin gearmeshing with the worm, an indicating disk, means tor holdingtheindicating disk in lirictional contact with the worm gear, a disk havinga series ot notches in its periphery secured to the indicatingl disk, aspring actuated latch adapted to engage with the notches in theperiphery ot the disk, and means on thel worm gear adapted to operatethe spring latch, whereby an intermittent rotary movement is given tothe indicating disk.

et. in a speed indicator, a trame, a spindle rotatably supported in thetrame, a worm on the spindle, a worm gear meshing with the worm, anindicating oisk having a mille l edge, means for htndin.4 the indicatingdisk in trictional contact 1th the worm gear, a wheel having a millededge rotatably secured to the traine in a position for the periphery ofthe wheel to engage with the periliihery of the indicating disk, wherebythe indicating disk may be revolved independent ot the ".vorm gear byturning the wheel.

5. ln a speed indicator, a traine, a spindle rotatably supported in thetrame, a worm on the spindle, a worin gear meshing with the worm, anindicating;I disk, means 'tor holdingl the indicating disk in trictionalcontact with the worm gear, a disk having a series ot vi-shaped notchesin its periphery secured to the indicating disk, a spring actuated latchreciprocally supported in the traine and having itt-shaped end adaptedto engage with the lJ-shaped notches in the pernahery ot the disk, and astud on the worm gear adapted to engage with the latch, whereby anintermittent rotary movement is given to the indicating disk.

6. ln a speed indicator, a trame, a spindle rotatably supported in theframe, a worin on the spindle, a worm gear meshing with the worm, anindicating disk on the worm gear having a milled edge, means for holdingthe indicating disk in rictional contact with the worm gear, a diskhaving a series ot notches in its periphery secured to or formedintegral with the indicating disk, a spring actuated latch in the frameadapted to engage with the notches in the periphery ot the disk, a studon the worm gear adapted to engage with the latch, and a wheel having amilled edge rotatably secured to the trame in a `position to extendbeyond the frame and for the periphery of the wheel to engage with theperiphery of the indicating' disk, whereby an intermittent rotarymovement is given to the indicating disk and the indicating disk may berotated by the milled wheel.

7. in a speed indicator, a frame, a spindle rotatably secured in theframe, a worm on the spindle, a worin gear in the frame meshing with theworm, a. hub on the worin gear rotatably supported in the back ot theframe and extending from the back to the frontot the frame, anindicating disk on the worm gear, means tor holding the indicating diskin trictionai contact with the worm gear, a disk having a series otnotches in its periphery secured to the indicating disk, a springactuated latch in the trame adapted to engage with the notches in theperiphery of the disk, a stud on the worm gear adapted to engage withthe latch, a. wheel rotatably secured to the frame in a? position forthe periphery of the wheel to engage with the periphery of theindicating disk, tixed indicating disks on the front and back otl the`rame, and pointers secured to each end of the worm gear hub in aposition to extend over the ixed indicating disks.

8. In a speed indicator, a spindle, a Worm on the spindle, a worm gearmeshing with the worm, a. rotatable indicating disk, a front ixedindicating disk, a front pointer secured to the hub of the worm gear, aback fixed indicating disk, a back pointer secured to the back hub ofthe worm gear, and means operatively connected with the rotatableindicating disk, whereby the said disk may be revolved by handindependent of the worm or worm gear.

9. In a speed indicator, the combination ont the followinginstrumentalities; a trame a, a handle Z) on the frame, a spindle crotatably supported in the frame and having a worm 14C, a worm gear d inthe frame meshing with the worm 14e, a rotatable indicating disk e onthe worm gear, a disk 24e havi ig a series of notches 25 25 in itsperiphery secured to the indicating disk e, means for holding theindicating disk e in rictio-nal contact with the worm gear cl, a springactuated latch f reciprocally supported in the frame in a position toengage with the notches 25 25 in the periphery of the disk 24, ashoulder 28 on the latch, a stud 18 on the worm gear Z in a position toengage with the shoulder 2S on the latch, a set back wheel 7 rotatablysecured to the trame in a position for the periphery of the set backwheel g` to engage with the periphery of the indicating` disk e, a frontixed indicating disk 7L, a front pointer z' secured to the hub of theworm gear cl, a back fixed indicating disk 7c, and a back pointer Zsecured to the hub of the worm gear CZ, as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRANK SPALDNG. litnesses:

ADA E. HAGERTY, J. A. MiLLER.

